20 mL Headspace Vials - Headspace Vials by volume | Sigma-Aldrich. SU860049. Headspace vial, beveled top, rounded bottom volume 20 mL, clear glass vial, O.D. × H × I.D. 23 mm × 75.5 mm × 12.5 mm, for use with PerkinElmer, pkg of 100 ea. pricing. 854978. Headspace vial, beveled top, rounded bottom volume 20 mL, beveled finish clear glass